The average weight of 39 boys travelling to Ladakh is 30. If an fat boy with weight 130 kg join them. What will be the average weight of the group travelling to Ladakh?
Show answer & explanation
Correct answer: C
Explanation
Total weight of 39 boys = 39 × 30 = 1170 kg
Weight of the new boy = 130 kg
Total weight now = 1170 + 130 = 1300 kg
Total boys = 39 + 1 = 40
New average weight = 1300/40 = 32.5 kg